Sorry for the late reply.
I just want to say that I think that the nightly build looks good because it offers:
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audio/sound scrubbing and playback (super awesome and helpful, good for lip sync and musical timing like beat tapping)
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more advanced onion skin controls
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light table mode (finally, no more making my own “light table” layers, quite invaluable)
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field overlays such rule of thirds, golden ratio, center and safe areas (good for open matte photography and character blocking)
I’m proud of you and others who made contributions to the upcoming version. 
The only thing that I really hate however is I can’t lift the timeline window up to show all the layers within it. It is really important that I see as many layers as the window will allow. I can only see the first two layers. The timeline window really sucks and needs to be fixed. 
But overall, this nightly build isn’t too bad; it’s a minor change but a major improvement over the current version. Keep up the good work and I’ll be looking forward to the Pencil 2D news update and latest version. 